display AUDI A4 2000 B5 / 1.G ATQ Engine Motronic On Board Diagnostic Workshop Manual

01-1


Motronic, On Board
Diagnostic (OBD)

On Board Diagnostic (OBD), technical
data


Equipment

Data is transmitted between the control module
and the VAS5051 tester or VAG1551 Scan Tool
(ST) via operating mode "Rapid Data Transfer".
DTC memory is designed for permanent
memory and is therefore not dependent on
voltage supply.
Display of stored DTCs occurs after initiation of
display mode Page 01
-15
.

DTC memory must be erased after malfunction
is repaired Page 01
-15
.

Important:

Readiness code must be re-generated after
every time DTC memory is erased Page 01
-
82
.
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01-10

WARNING!

Observe safety precautions Page 01
-8 .

Note:
The following description only explains
implementation of On Board Diagnostic using
VAG1551 Scan tool.
When using the VAS5051 tester, observe the
tester's instructions for use V.A.G - ON BOARD DIAGNOSTIC
HELP
1 - Rapid data transfer 1)2 - Blink code output 1
)

Indicated on display: 1) Operating modes 1 and 2 are displayed alternately
Note:
If nothing appears in display:
- Perform troubleshooting procedure after "troubleshooting procedure leak
test":
Electrical Wiring Diagrams, Troubleshooting & Component Locations
binder
Depending on desired function Table "Selectable functions", page
Page 01
-14
:
- Switch ignition on.
or
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01-11

- Press -Print- button to turn on Scan Tool (ST)
printer. Indicator lamp in button must light up.

- Press button 1 to select "Rapid data transfer"
operating mode 1. Rapid data transfer
HELP
Insert address word XX

When indicated on display:
Note:
The address word 00 initiates the automatic test sequence, i.e. it results in
a DTC check on all OBD capable systems in the vehicle via rapid data
transfer.
- Press buttons -0- and -1- to select "engine electronics" and press -Q-
button to confirm input.
3B0907551BA
2.8l V6/5V
G
0003
Codin
g 07251
WSC 12345

VAG1551 Scan Tool (ST) display indicates control module identification,
e.g.:
Note:
Control module identification can be printed by pressing the PRINT key of
the VAG1551 scan tool.
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01-12

Control module identification (example)

3B0907551
BA part number; allocation
Parts Catalog 2.8 LEngine displacement V6/5VConstruction style of engine (V
engine, 6 cylinder, 5 valves) "G" i.e. no
indication Vehicle with or without cruise
control system 0003Data version (software
version) of control module Coding
07251 Control module coding WSC 12345 Factory identification of
VAG1551, with which the last
coding was performed

-
Press button.
Rapid data transfer
HELP
Select function XX

Indicated on display (function selection):
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01-13

Notes:

It will be possible to display the control module
identification again after pressing buttons -0-
and -1- to select "Check Control Module
Versions" and confirming with the -Q- button.
Rapid data transfer
HELP
Control module does not answer

When indicated on display:
Rapid data transfer
HELP
K-wire not switchin
g to Ground

- Perform troubleshooting procedure after "troubleshooting procedure leak
test":
Electrical Wiring Diagrams, Troubleshooting & Component Locations
binder
Rapid data transfer
HELP
K-wire not switchin
g to B+

Rapid data transfer
HELP
Error in communication link

Pa
ge 17 of 19 Motronic, On Board Dia
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)
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